Bug 458016

Summary: kernel: random32: seeding improvement [mrg-1]
Product: Red Hat Enterprise MRG Reporter: Eugene Teo (Security Response) <eteo>
Component: realtime-kernelAssignee: Luis Claudio R. Goncalves <lgoncalv>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 1.1CC: bhu, davids, lgoncalv, security-response-team, williams
Target Milestone: 1.0.3   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-10-07 19:20:43 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 458019, 458021, 458022, 458023, 458212    
Attachments:
Description Flags
Upstream patch for this issue none

Description Eugene Teo (Security Response) 2008-08-06 06:16:20 UTC 
Description of problem:
Stephen Hemminger wrote a patch to improve random32() seeding.

The rationale is:
   * use u32 consistently
   * no need to do LCG on values from (better) get_random_bytes
   * use more data from get_random_bytes for secondary seeding
   * don't reduce state space on srandom32()
   * enforce state variable initialization restrictions
Comment 1 Eugene Teo (Security Response) 2008-08-06 06:18:35 UTC 
Proposed upstream patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=697f8d0348a652593d195a13dd1067d9df911a82
Comment 2 Eugene Teo (Security Response) 2008-08-06 06:22:51 UTC 
Created attachment 313529 [details]
Upstream patch for this issue
Comment 4 Eugene Teo (Security Response) 2008-08-26 16:54:13 UTC 
It needs the following upstream patch as well:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=61407f80f72970d52d4339f81c6c3cd03f4ca0f0
Comment 5 Luis Claudio R. Goncalves 2008-09-04 20:42:52 UTC 
This second patch is queued for -79
Comment 7 David Sommerseth 2008-09-23 08:42:33 UTC 
Verified that upstream patch 697f8d0348a652593d195a13dd1067d9df911a82 is included in mrg-rt-2.6.24.7-81
Comment 9 errata-xmlrpc 2008-10-07 19:20:43 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2008-0857.html